“Last year my tomatoes struggled a lot. I think my soil might be tired. Should I rotate spots or should I fortify the soil? Thank you.” Question from Lucinda of Pittston, Maine
Answer: Tomatoes must be rotated on a three-year cycle for best performance, especially if they have experienced diseases. They are heavy feeders, experience lots of soil-borne diseases that can carry over in the soil from year to year, and root-knot nematodes are common pests that lower production and can live in the soil from year to year. Rotation fixes all of these problems. I recommend rotating tomatoes with soil-fortifying crops, such as peas and beans, which naturally add nitrogen to the soil. Tomatoes take up lots of nitrogen and fertilizer!
From there, I also suggest that you try short-season varieties adapted to northern climates. You can find several listed in the first article below.
“How early can potatoes be planted in zone 5?” Question from Lisa of Berwick, Maine
Answer: Your last frost date is May 10th, and you have a growing season that is approximately 142 days long, according to the Old Farmer’s Almanac. You can plant potatoes in the ground as early as four to five weeks before your last frost date, so that would be early April in Berwick, Maine. You can also plant them a bit later. Potatoes grow well in your cool summers. Keep in mind that there are early, mid-season, and late-season potatoes that take varying amounts of time to be ready for harvest, so consider this when choosing the best potato varieties for your garden. Generally, earlier types are better for northern climates. (Johnny’s Selected Seeds is a great potato source for your region.)
Potatoes should be planted 6 to 12 inches apart in rows around 2 to 3 feet apart. They like deep, friable soil, so consider planting them in mounds amended with quality compost, such as Black Gold Garden Compost Blend, which is OMRI Listed for organic gardening. Cover each seed potato with at least 3 inches of soil. In your cold region, planting them a bit deeper might be wise.